Step 1: Pick something you like.Step 2: Think of as many ways as possible to make it better, more efficient, more durable, cheaper, longer lasting, more entertaining et cetera. Step 3: Which solution from step 2 are your skills or connections the best fit for? Step 4: Find inexpensive way to put prototype in front of potential customers. Step 5: Note feedback from step 4 and iterate. Step 6: Profit. (Step 7: Contribute.)